| 摘要 |
<p>The stopper comprises a top (1) with a tapping (2). A cap (3) which rotates freely in one direction on the screw top has an opening (4) in its top (5). An elastic ring (6) which is housed in a groove in the internal lateral face of the cap mates with the lower edge (7) of the top so as to prevent the top from leaving the cap . The upper face of the top has a dihedral part (8) constituting a male part. The cap has an upper sleeve (9), having the same axis (XX') as the cap, whose two bosses (10) overhang the male part. The key for the removal of the stopper has a female part of complementary form to the dihedral part of the male top and indentations conjugate with the bosses.</p> |
